Question

If f (x) = – 4x3 + 2x2 – 1, find f (– 1)

Answer 1

Answer:

$f(-1)=5$

Step-by-step explanation:

We know that the equation is

$f(x)=-4x^3+2x^2-1$

We can then plug -1 in for x

$f(-1)=-4(-1)^3+2(-1)^2-1\\\\f(-1)=-4(-1)+2(1)-1\\\\f(-1)=4+2-1\\\\f(-1)=5$

Answer 2

ANSWER

$f( - 1) = 5$

EXPLANATION

The given function is

$f(x) = - 4 {x}^{3} + 2 {x}^{2} - 1$

We substitute x=-1 to obtain:

$f( - 1) = - 4 {( - 1)}^{3} + 2 {( - 1)}^{2} - 1$

We simplify to obtain;

$f( - 1) = 4 + 2 - 1$

.

This evaluates to

$f( - 1) = 5$